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A-MAV™ Anterior Motion Segment Replacement

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00635934
Recruitment Status : Completed
First Posted : March 14, 2008
Last Update Posted : September 18, 2018
Information provided by (Responsible Party):
Medtronic Spinal and Biologics

Brief Summary:
The purpose of this clinical trial is to collect safety and effectiveness data concerning the A-MAV™ Anterior Motion Segment Replacement device as a method of treating patients with lumbar degenerative disc disease at one level from L4-S1. Overall success will be the primary clinical endpoint.

Condition or disease Intervention/treatment Phase
Spinal Diseases Device: A-MAV™ disc Not Applicable

Detailed Description:
For this clinical trial, there is only one treatment group- patients receiving the A-MAV™ Anterior Motion Segment Replacement via an anterior surgical approach in the lumbar region of the spine from L4-S1.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 53 participants
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Prospective, Non-Randomized Pilot Clinical Investigation of the A-MAV™ Anterior Motion Segment Replacement in Patients With Lumbar Degenerative Disc Disease
Study Start Date : December 2005
Actual Primary Completion Date : October 2009
Actual Study Completion Date : May 2010

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: A-MAV™disc Device: A-MAV™ disc
The A-MAV™ device is a spinal arthroplasy system intended to replace a damaged spinal disc. It is inserted using an anterior surgical approach and aims to reduce low back pain and maintain disc height at the affected level.
Other Name: A-MAV™

Primary Outcome Measures :
  1. Overall Success= Oswestry Disability Index success; Maintenance or improvement in neurological status; No serious AE classified as implant or implant/surgical procedure associated; No additional surgical procedure classified as a failure [ Time Frame: 24 Months ]

Secondary Outcome Measures :
  1. Disc height; SF-36; Back Pain Status; Leg Pain Status; Patient Satisfaction; Patient Global Perceived Effect; Other Measurements-Radiographic; Return to Work; Doctor's Perception of Results [ Time Frame: 24 Months ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 70 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Has back and/or radicular pain with degeneration of the disc as confirmed by patient history, physical examination, and radiographic studies with one or more of the following factors:

    • instability as defined by > 5° angulation
    • osteophyte formation of facet joints or vertebral endplates
    • decreased disc height, on average by >2mm, relative to the next adjacent vertebral segment
    • scarring/thickening of ligamentum flavum, annulus fibrosis, or facet joint capsule
    • herniated nucleus pulposus
    • facet joint degeneration/changes
    • vacuum phenomenon
  • Has single-level symptomatic degenerative involvement from L4-S1 requiring surgical treatment
  • Has intact facet joints at the involved vertebral levels documented by CT and/or MRI
  • Has preop Oswestry score≥30
  • Has preop back pain score ≥8
  • Age 18 to 70 yrs, inclusive and is skeletally mature
  • Has not responded to non-operative treatment for 6 mos
  • If child-bearing potential, patient is non-pregnant, non-nursing, and agrees not to become pregnant for 1 yr after surgery
  • Is willing and able to comply with the study plan and sign the Patient Informed Consent Form

Exclusion Criteria:

  • Has primary diagnosis of a spinal disorder other than DDD at involved level
  • Had previous anterior lumbar spinal surgery at involved level
  • Had previous posterior lumbar spinal fusion surgical procedure at involved level
  • Had prior posterior lumbar surgery resulting in significant muscle/ligament morbidity, not including facet saving techniques
  • Requires surgical intervention at more than 1 lumbar level
  • Has severe pathology of facet joints of involved vertebral bodies
  • Has facet arthritis or any posterior element insufficiency
  • Has spondylolisthesis
  • Has mid-sagittal stenosis of <8mm, based on remaining canal diameter
  • Has rotatory scoliosis at involved level
  • Has lumbar scoliosis with >11° sagittal plane deformity
  • Had previous trauma to L4, L5, or S1 levels in compression or burst
  • Meets any of the following criteria: Previous diagnosis of osteoporosis, osteopenia, or osteomalacia; postmenopausal Non-Black female over 60 yrs of age and weighs less than 140 pounds; postmenopausal female that has sustained a non-traumatic hip, spine or wrist fracture; male over age 60 that has sustained a non-traumatic hip or spine fracture. If Yes to any of these, a DEXA scan is required. If level of BMD is -3.5 or lower or -2.5 or lower with vertebral crush fracture, the patient is excluded
  • Had previous lumbar spinal fusion at adjacent level
  • Bone growth stimulator use in spine
  • Has obesity defined by BMI greater than or equal to 40
  • Has arachnoiditis
  • Has a non-contained or extruded herniated nucleus pulposus with acute nerve root compression
  • Has condition that requires postop medications that interfere with bone metabolism, such as chronic steroid use or prolonged use of non-steroidal anti-inflammatory drugs, excluding routine perioperative, non-steroidal anti-inflammatory drugs. Does not include low dose aspirin for prophylactic anticoagulation
  • Has overt or active bacterial infection, either local or systemic and/or potential for bacteremia
  • Has presence or prior history of malignancy (except for basal cell carcinoma of skin)
  • Has documented metal allergy, titanium alloy intolerance or cobalt-chrome-molybdenum alloy
  • Is mentally incompetent. If questionable, obtain psych consult
  • Has a Waddell Signs of Inorganic Behavior score of 3 or greater
  • Has chronic or acute renal and/or hepatic failure or prior history of renal and/or hepatic parenchymal disease
  • Is prisoner
  • Is pregnant
  • Is an alcohol and/or drug abuser as defined by currently undergoing treatment for alcohol and/or drug abuse
  • Has history of autoimmune disease
  • Has received treatment with an investigational therapy within 30 days prior to implantation surgery or treatment is planned during 24 months following the implantation surgery
  • Has history of any endocrine or metabolic disorder known to affect osteogenesis
  • Has any disease that would preclude accurate clinical evaluation

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00635934

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United States, Georgia
Hughston Clinic
Columbus, Georgia, United States, 31908
United States, Missouri
Orthopedic Center of St. Louis
Chesterfield, Missouri, United States, 63017
United States, Texas
Central Texas Spine
Austin, Texas, United States, 78731
Sponsors and Collaborators
Medtronic Spinal and Biologics

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Responsible Party: Medtronic Spinal and Biologics Identifier: NCT00635934     History of Changes
Other Study ID Numbers: P04-05
First Posted: March 14, 2008    Key Record Dates
Last Update Posted: September 18, 2018
Last Verified: October 2011
Keywords provided by Medtronic Spinal and Biologics:
Lumbar Degenerative Disc Disease at One Level from L4-S1
Additional relevant MeSH terms:
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Spinal Diseases
Bone Diseases
Musculoskeletal Diseases